Displaying stored values from a SQL statement in JAVA

Hi,

I have a sql statement (other than select, update, insert, delete) which gives the total number of customers in the table.

How can I display that value in a java programme??

Do, i need to store that value in a variable ("Select total = count(*) from customers) and display that variable or what??

Thanks for your help here asap!!

Regards.
PCMENIACAsked:
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zzynxSr. Software engineerCommented:
Handling the result of the query

       select column from table

is just the same as handling the result of the query

       select count(*) from table
zzynxSr. Software engineerCommented:
int total = -1;
try {
        Statement stmt = connection.createStatement();
        ResultSet rs = stmt.executeQuery("SELECT count(*) FROM my_table");
   
        while (rs.next()) {
            total = rs.getInteger(1);
        }
    } catch (SQLException e) {
    }

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zzynxSr. Software engineerCommented:
Now the total number of records is in the variable "total".
You can display it now whereever and however you want

E.g.

JLabel myLabel1 = new JLabel("Total # records:");
JLabel myLabel2 = new JLabel();
yourPanel.add(myLabel1);
yourPanel.add(myLabel2);

myLabel2.setText(""+total);
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CEHJCommented:
The easiest way for an arbitrary query is to do something like resultSetToTableModel here:

http://www.experts-exchange.com/Programming/Programming_Languages/Java/Q_21066632.html
PCMENIACAuthor Commented:
ZZYNX,

Thanks for the solution, but can you pls tellme what does 1 refer to in "total = rs.getInteger(1);"

Also, how can we retrieve more than 1 result returned by the query

thx.
CEHJCommented:
>>Also, how can we retrieve more than 1 result returned by the query

See my answer above - it works for any query
zzynxSr. Software engineerCommented:
>> what does 1 refer to in "total = rs.getInteger(1);"
To the first column of the query (in this case there's only one: count(*))

e.g. if you have this query
   select column1, column2, column3 from table

your code could look like:

  String column1 = rs.getString(1);   // get the first field of the resulting record
  int column2 = rs.getInteger(2);     // get the 2nd field of the resulting record
  String column3 = rs.getString(3);  // get the 3rd field of the resulting record
zzynxSr. Software engineerCommented:
So if your table contains

column1     column2     column3
---------------------------------------
Name1        1               Hello
Name2        2               World

during the first run of the while (rs.next()) { loop

    the 'column1' var will contain "Name1", the 'column2' var will contain 1 and the 'column3' var will contain "Hello"

during the second run of the while (rs.next()) { loop

    the 'column1' var will contain "Name2", the 'column2' var will contain 2 and the 'column3' var will contain "World"

zzynxSr. Software engineerCommented:
Each run of the loop stands for another record in your table
PCMENIACAuthor Commented:
ZZynx,

The method is not getInteger() but getInt().

Thanks anyways for the detailed explanation as well.


zzynxSr. Software engineerCommented:
>> The method is not getInteger() but getInt().
Sorry. I typed it by heart.
Is that the reason for giving a C-grade?
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